It's a simple decision.

Slam the door on one of the X's you're considering picking up. Then go to MB and slam one of the doors on the ML. The X door will close with a healthy "thunk" the ML door will sound like a hyundai ping.
The quality just isn't there on the ML.

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You have your way. I have my way. As for the right way, the correct way, and the only way, it does not exist.